Cutter chain



J. A. HAYWARD 2,390,251

CUTTER cHAiN Filed April 13, 1943 l si :L:

fzzfaywar. AML 4 Wm' Zig? Patented Dec. 4, 1945 CUTTER CHAIN J ohn A. Hayward, Claremont, N. H., assignor to Sullivan Machinery Company,` a corporation of Massachusetts Application April 13, 1943, Serial No. 482,875

Claims.

This invention relates to kerf cutting devices, and more particularly to improvements in a reversible cutter chain especially designed for use in the cutting of coal.

An object of the present invention is to provide an improved kerf cutting device. Another object is to provide an improved cutter chain especially designed for use in the cutting of coal. A further object is to Aprovide an improved double-ended, reversible cutter bit. Yet another object is to provide an improved mounting and holding means for a cutter bit. Another object is toprovide an improved chain block structure for a cutter chain.` A still further object is to provide an improved reversible cutter chain. These and other objects will, however, hereinafter more fully appear.

In the accompanying drawing there are shown for purposes of illustration two forms which the invention may assume in practice.

In this drawing:

Fig. 1 is a side elevational view showing a cutter chain constructed in accordance with one illustrative embodiment of the invention.

Fig. 2 is a cross sectional view taken substantially on line 2-2 of Fig. l, showing parts in front end elevation.

Fig. 3 is a view in longitudinal vertical section taken substantially on line 3--3 of Fig. 2.

Fig. 4 is a detail vertical sectional view taken substantially on line 4-4 of Fig. 3.

Fig. 5 is a horizontal sectional viewtaken substantially on line 5-5 of Fig. 3.

Fig. 6 is a perspective view of the improved bit holder. 4

Fig. 7 is a perspectiveview of the front bit anvil.

Fig. 8 is a perspective view of the improved cutter ha.

I Fig. 9 is a top plan view of the clamping bolt.

Fig. 10 is a side elevational view ofthe clamping bolt shown in Fig. 9. i 1

Fig. 11 is a cross sectional view taken on line II--II of Fig. 10.

Fig. 12 is a sectional view similar to Fig. 3, illustrating another embodiment of the invention.

wardly at 6 near the top of the lug, and open'at Fig. 13 is a cross sectional view taken substan- A its sides as shown in Figs. 1 and 4. A longitudinal bore 1 in the lug communicates with the lower portion of the block socket. Received in the block socket is a detachable bit holder. 8, while received lin the block bore 'I is a clamping bolt 9 for adjusting the holder into bit clamping position, A

cutter bit IIJ of an improved design is positioned between the holder and a detachable iront bit anvil I I, the latter likewise positioned in the block socket. The stem I2 of the bolt 9 is reduced and passes through a bushing I3 tted in the bore 1 at the rear side of the block socket, and this stem is threaded for engagement with Va tightening nut I4 whichabuts the rear surface of the block lug 4.

The cutter bit Il] is of the double-ended, reversible throw away type, preferably formed by forging, and isgenerally of trapezoidal shape in side elevation. The bit has a plane iront face I5 of elliptical shape terminating in cutting points I6, I6 at the opposite extremities of the bit body. The bit is formed with cutting portions I1 whichinclude the cutting points I6, and

fthese cutting portions are generally T-shape in cross section as shown in dotted lines in Fig. 5. A relatively narrow flange I8 provides the leg Yof the T at the back of the bit, and this flange is arcuately notched at I9 midway between the ends of the bit. The bit body is thickened in cross section at 20 in adjacency to the notch I9, and the thickened portion has relatively inclined sides. The flange I8 at the back of the bit has Ainclined end surfaces 2`I at the opposite ends of the bit, and these inclined surfaces recede rearwardly from the cutting points I6. In this instance, the cutter bit is located at the longitudi- `nal vertical center of the chain block and the bolt 9 is slotted longitudinally at 22 to receive the inner-inactive cutting portion of the cutter bit in the manner shown in Fig. 3.

The holder 8 has an outer head portion 23 and an inner shank portion 24, and the latter portion is formed with a bore 25 through which the clamping :bolt 9 extends. The forward portion of the bore 25 is inclined or tapered as shown at 26, `and the'boli; 9 has a wedge-shaped portion* 21 engageable with the walls of the inclined or tapered portion of the holder bore so that when the bolt is moved rearwardly relative to the block, the holder is forced inwardly with a wedging action for a purpose to be later described. The

holder head 23 is centrally vertically slotted at 28 at its forward side, and the flange I8 at the back of the blt is received in this slot. The holder head at the sides of the slot engages at 29 the relatively inclined sides of the central thickened portion of the bit. The holder has a rearward projection 30 received in a vertical slot 3| at the rear side ofthe block socket for preventing lateral displacement of the holder with respect tov the block. The bottom of the holder slot 28 is formed with an arcuate projection 32 which is received in the notch I9 in the bit ange to hold the bit against longitudinal.

displacement in the holder slot.

The front bit anvil Il has a forward projection 33 which, at its inner surface 34, rests against the outer surface of the block lug iIi advance of the block socket in the manner in Figs. 1 and 3. The anvil has a shank portion 35 extending into the block socket and slotted at 36 to receive the bolt 9 so that the shank portion of the holder straddles the bolt. The anvil has an inner surface 31 at the bottom of the slot 36 which rests against the upper surface of the bolt, and provides a rearwardly facing,A forwardly and outwardly inclined plane surface 38 against which the plane front face 45 of the cutter bit rests. The sides of the bolt are flattenedv at 39 andthe straight sides of the anvil slot engage these flattened surfaces to hold the bolt against rotation. The block socket is vertically slotted or notched/at 40 at its'forward side, in a manner similar to its rear side, and the front bit anvil Il may have a projection, similar to the projection 30 on the holder, received in the slot for locking the anvil against lateral displacement. By reversing the bolt, holder and anvil with respect to the block, the cutter bit may be located in a position to out in the reverse direction in an obvious manner.

In the embodiment of the invention shown in Figs. 12 and 13, the cutter chain is similar to that above described. `A cutter bit 4l, substantially the same as the cutter bit l0, has its forward face 42 resting against an inclined surface 43 formed directly on the chain block at the forward side of the holder socket. `A clamping bolt 44 which is received in the longitudinal block bore is, in this instance, located at one side of the central longitudinal, vertical plane of the block, and the cutter bit is located at the other side of the plane, and the bolt is slabbed off at 45 to clear the inner portion of the cutter bit as shown in Fig. 13.v A bit holder 4B isY received in the block socket and has an inclined rear surface 41 engaging the rear wall of the socket, and the lower shank portion 48 of the holder is of cylindric shape and is fitted in a vertical bore 49. In this embodiment of the invention the holder and bit cannot be reversed with respect to the chain block due to the arrangement of the bolt and bit at opposite sides of the block.

In both embodiments of the invention the cutter bit, when one' point thereof becomes dull, zii'ay be released simply by loosening the nut on the clamping bolt and moving the latter forwardly in' the block bore to permit outward rectilinear movement ofthe holder, thereby to release the projection on the holder from the notch at the back of the bit. In the 'r'st embodiment the front anvil Il may be removed upon loosening of the holder, to facilitate removal of the cutter bit. pon release, the cutter bit may be turned end for end and replaced on the holder, and upon tightening of the bolt the holder is drawn iriwardly with a wedging action in the block socket ii'irrlly to clamp the bit in cutting position on the block. When both cutting points of the cutter bit become dull, the bit, due to its inexpensive design, may be discarded. The particular arrangement of the bolt and holder provides an extremely eifective bit holding means wherein possibility of the holder becoming loose and lost is substantially avoided. By a simple rearrangement of the parts, in one embodiment, the position of the cutter bit VNmay be reversed on the bilock. lThe manner of use and other` advantages of the improved cutter chain will be clearly apparent to those skilled in the art.

While there are in this application specifically described two forms which the invention may assume' in practice, it will be understood that these forms of theysazne are shown for purposes of lllustrat'ion and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. In a cutter chain, a chain block having a socket extending substantially at right angles to the path of travel of the chain., said socket having outwardlyinclined front and rear Awalls near the outer end ofsaid socket,- aA front bitanvil resting on the exterior of said block outside of said block socket and normally stationary with respect to said block,Y said -anvil having a portion projecting into said socket and engaging the front inclined socket wall` a bit holder received in said socket rearwardly of said anvil and engagingthe rear inclined socket wall, and means engaging said holder for adjusting the latter inwardly in said socket relative to saidV anvil to clamp a cutter bit in cutting position against said anvil,

2l In a reversible cutter chain, a chain block having a socket extending substantially at right angles to the path of travel ofthe chain, said socket having outwardly inclined front and rear walls near the outer end of sa-id socket, said inclined walls each having a narrow vertical recess therein of substantially less width than the width of said. socket,- a frontbit anvil resting on the exterior of said block and normally stationary with respect to said block, said anvil having a portion projecting into said socket and engaging the front inclined socket Wall and overlying the front recess, a bit holder received in said socket rearwardly of said av'il and engaging the rear inclined socket wall, said holder having a' narrow rearward projection tting therear recess for locking said holder against lateral movement with respect to said block, and said holder and anvil being rversible with respect to said block iri said socket, and said holder projection engaging' said other recess for locking' the holder' to said block when said holder is in reversed position in said socket; and means engaging said holder in either reversed position thereof in said. socket for adjusting said holder inwardly;r in said socket relative to said anvil to clamp a cutter bit in cutting position against said anvil. Y

3. In a cutter chain, a chain blockv having a socket and a longitudinal bore, and a front bit anvil resting against an exterior surface of the block in advance of Said socket and having a portion projecting into said socket, a bit holder received in said socket, and a bolt received in said bore and engaging said holder for adjusting the latter rectilinearly inwardly in a direction at substantially right angles to the longitudinal axis of said bolt into a position to secure a cutter bit in cutting position against said anvil, said projecting portion of said anvil resting against said bolt in advance of the point of engagement of the lati ter with said holder.

4. In a cutter chain, a chain block having a socket and a longitudinal bore, and a front bit anvil resting against an exterior surface of the block in advance of said socket and having a portion projecting into said socket, a bit holder received in said socket, and a bolt received in said bore and engaging said-holder for adjusting the latter rectilinearly inwirdly in a direction at substantially right angles to the longitudinal axis of said bolt into a position to secure a cutter bit in cutting position against said anvil, said projecting portion of said anvil engaging said bolt to hold the latter against rotation in said bore during adjustment of said holder.

5. A clamping wedge-bolt having a cylindrical body provided with a wedge shaped portion in spaced relation longitudinally from its ends, said bolt body having a longitudinal slot in its upper surface into which the inner portion of a cutter bit is adapted freely to extend, the cylindrical body at the opposite sides of said Wedge shaped portion being flattened for engagement With means for holding the Wedge-bolt against rotation.

JOI-IN A. HAYWARD. 

